To ensure functionality and reliability, all vintage tube testers require a comprehensive restoration—regardless of cosmetic condition—as they inevitably show wear from age. Once restored, you will have a fully functional and reliable unit ready for regular use.
This specific tube tester has undergone a complete cosmetic and electrical restoration.
Electrical Restoration:
All the wiring was checked according to the schematic; the solder joints were thoroughly checked to verify that they were all quality made. Corrections were made where needed.
The entire chassis was deeply cleaned.
All the resistors were replaced.
A new 0.1 capacitor was installed.
All switches and rotary switches were thoroughly cleaned and lubricated.
Tube sockets pins and potentiometers were cleaned.
The 6H6 tube socket inside the tester was cleaned, the 6H6 tube was checked, it is working good.
The transformer was checked for proper operation, it is working as it should for element test voltages: 30,110 and 250 Volts AC and for filament voltages: 0.75, 1.4, 2, 2.5, 3.3, 5, 6.3, 7.5, 9.45, 12.6, 25, 30, 50, 70 and 110 Volts AC.
Vacuum tube test cap cables were replaced.
The roll chart mechanism was completely disassembled, cleaned, reassembled, lubed and adjusted for a free operation.
The roll chart is complete and clear; however, I have included a quality courtesy copy of the *Eico Tube Data Book* for your convenience, as it provides more comprehensive data and simplifies the tube setup process.
The meter was cleaned and a new meter face was installed.
All new rubber grommets.
The light bulbs are new.
Cosmetic restoration:
The front panel was thoroughly cleaned, as well as the screws, levers and knobs.
The cabinet was scraped, sanded, primed and repainted.
The plastic window was replaced.
This tester supply correct voltage values according to the line voltage.
The tester was calibrated and tested for filament and plate voltage values and operating voltages, with satisfactory results.
Additional extensive testing was performed using reference tubes, validating functionality across "Good," "Replace," and "Weak" states, as well as simulating "Overload" and "Short" conditions, the results from this EICO 625 match the results obtained with my main reference tube tester. This tube tester is fully operational and ready for use.